Carbureter.



H. A. JOHNSON.

GARBURETER.

APPLICATION FILED SBPT.23, 1910.

f Y Y M u, 2

I"TUNTTED sTATEs PATENT onnicn.

. HENRY A. JOHNSON, OF CHICAGO, ILLINOIS.

CARBURETER.

Specification of Letters Patent.

Patented Aug. 5,1913.

Application led September 2a, 1910. Serial No. 583,440.

To all who/ml 'it may concern Be it known that I, HENRY A. JOHNSON, acitizen of the United States of'America, and a resident of Chicago,county of Cook, State of Illinois, have invented-certain -new and usefulImprovements in Carbureters, of which the following is a specification.`

The main objects of this invention are to provide an improved carbureterfor internal combustion engines of the class where a part of the airsupply is drawn through the l liquid fuel instead of spraying the'liquid into the moving air; to provide'a construction in which arelatively coarse adjustment of the level of the fuel in the carbureterwill secure complete saturation; to. provide means for. removing anexcess of liquid in the vapor; and to 'provide improved means -whichwill prevent loss of fuel due to over` ilow.

A specific construction embodying this invention isi illustrated in theaccompanying drawings, in which- A Figure 1 is a vertical sectional viewof ,the complete carbureter, the tank being'shown diagrammatically. Fig.2 is a horizontal sectional view of the hood covering the air inlet.Fig.` 3 is a detail view of the fuel inlet valve.

In the construction shown,'the main'air supply is provided for by an airinlet pipe 1 which projects upwardly through the bottom of the casing 2to a position above the normal liquid fuel level 3. Covering the airinlet pipe 1 is a flat top and H ute-sided hood 4 having an integralflared flutedl skirt f The side fluting makesa sliding t with l, theunder side of the top' of thehood is fastened a rod 6, to whichis-secured a spring 7 normally holding the hood 4 in liquid.

tight contact with the .top of the inlet pipe A. A1. The Afuel supply isdelivered through 'a pipe 8, which passes through one of the verticalwalls of thecasing 2. The inner end of the pipe 8 is provided with anoutlet 9, which is at thenOrmal fuel level 8. A special pipe 10 extendsfrom the 'top of the supply tank 11 to liquid fuel level 3. The fuelinlet pipe A-8 Iis also Vprovided with a needle valve 12 whichslidesthrough a guide box 18, and is pivoted to the lever arm 14. The shortend of the lever arm 14- is pivoted to the inner wall of the casing at15. The long end of the lever arm is pivoted to the center. of a float16.

air inlet pipe 1.

rExcess liquid is removed from the vapor by a series of gravitydraining-baite plates 17, 18, 19, and 20, said baiie plates being soplaced as to form a tortuous passage for thevapor from the level of thefuel to the main outlet 21. The main vapor outlet 21 is provided with anoutlet pipe 22 secured Y'to the casing by screws 23, 23, and to the topof this outlet pipe is secured-a T-tting 24, oneend of which is providedwith an auxiliary airf valve 25, sald air valve being normally heldv onits seat 26 by a spring 27 secured to an adjusting screw28. The en'd s lof the pipe 24 opposite the auxiliary'air ,valve 25 is connected totheengine. i

In operation, the maintenance of the level of `the fuel supply isprovided, by placing 'the outlet 9 of the fuel inlet pipe 8 and theinlet ofthe special air pipe 10 at the normal level of the liquid fuel3. The carbureter, lwhen operated with a closed supply tank, willmaintain the fuel level automatically at the position of the outlet 9,due to the pneumatic action of the supply tank. In case the supply tankis not hermetically closed, reliance is placed upon the action of th'efloat 16. The flo-at 16 israised by the rise in the level of the fuel,and the fuel in, let pipe S 'is closed by the movement, of the needlevalve 12, which is controlled by the float. In this carbureter, thelioat 16 is in action only when the pneumatic control fails, and thelevel of the liquid rises\above the normal Working level 3. Closure ofthe fuelv inlet pipe by theaction of the needle valve 12 will take placebefore the level of the liquid fuel rises above the top. ofthe If forany reason it is found necessary to depend -on the needle valvetomaintain the fuel level, then spilling of the fuel through the air inletpipe will be prevented by the seat-ing of the flat i top of the hood onthe upper end of the air inlet pipe.

. The mixture of the vair with the liquid fuel is accomplished `throughthe suctlon stroke of the engine to which the carbureter 'is connected,and air pressure lifts the hood 4, allowing air to enter the casing bypassing under the hood. The uting on the sides forms separate passageswhich subdivide the charge of air taken by the carbureter. Alll the vairentering the carbureter must pass through thelliquid fuel from the loweredge of the flared skirt of the hood 4. The

' flared and fluted skirt 5 of the hood '4 prothrough the mass of theliquid fuel. As the air leaves the fuel, it carries along with it asmall quantity of the liquid in suspension, which is not vaporized, andthe`eXcess of liquid inthe vapor is removed by coming in Contact withboth the lower and upper surfaces of the battle plates 17, 18, 19, and20, which are disposed between the fuel level 3 and the outlet 21, sothat the vapor strikes rst the baiiie plate 17 whereit is drawn towardthe center of the carbureter, next against the under side ofthe bailleplate 18, Where the vapor must pass between the periphery ofthe batheplate 18 and the casing 2, and in a similar manner to the center of thebailie plate 19, thence aro-und the periph? ery of the baffle plate 20to the outlet. Vlhen the vapo-r reaches the outlet 2 1 it is fullysaturated. The thinning of the mixture 'so as to produce a rapid firingmixture is `accomplished by admitting air to the mixture through theauxiliary air valve 25. The adjustment of the amount of air takenthrough the auxiliary air valve and its relation to the suction ofthe'engine is controlled by 'adjustment of the tension of the spring 27through the holding screw 28, which is provided with a threaded surface.

Although but one specific embodiment of this invention is herein shownand described, it will be understood that numerous details of theConstruction shown may be altered or omitted without departing from thespirt of this invention, as defnedby the following claims.

lf claim 1. /A carbureter, comprising a casing adapted to contain aquantity of liquid and adapted to contain aquantity of liquid, saidcasing having a fuel outlet and a fuel inlet, means for automaticallycontrolling said fuel inlet to maintain a normal level of the liquidinfsaid' casing, an air inlet pipe extending into said casing andvterminating 'above the normal level of the liquid, a hood adapted toserve as a closure for the inner end of said inlet pipe, meansyieldingly urging said'hood to close said pipe, and an annular angespaced away from said inlet pipe and depending from said hood into theliquid for directing the air into the liquid.

Signed at Chicago this 19th day of September 1910.

' HENRY A. JOHNSON.

Witnesses: A

PHILIP B. WOODWORTH, EDWIN PHELPS.

